Hi, all

Have a question involving the repair of basic (usually 2nd or 3rd tier) syringe fillers... you know, remove the blind cap, dip in ink, pull the pulnger out, replace the bliind cap. OK, getting the section and plunger out is no problem. Cutting the seal is no problem thanks to David's tool. BUT... where can you buy a solicone rubber sheet to use to replace the gasket itself?

Or is silicone the best way to go? Is cork better? straight-up rubber sheets?

Also, what's the best way to attach them to the plunger?

Thanks for any help!!

I would propose to make a Delrin piston (on the lathe) equipped with a standard O ring.
The delrin piston could be press-fitted on the plunger.
Just my 2 cents....

That's cool, but what if you don't have a lathe... as with me?

HI. Anyone else have a tip or two they can contribute? It'd be appreciated. Thanks

A cheap way to form the delrin is on a drill, clamped in a vise or drill stand using sandpaper, if you don't have any cutting tools. It will not be as perfect as a lathe but if you take your time and go slow, with several test fittings it will work. On the otherhand a cheap (for a lathe) sherline minilathe with tools can be had on "the bay" for about $200-$225. It is amazing the uses you will find for it. I just made a set of brass drifts on it for 2mm to 6mm for repairing safety pens, took me about 30 total.
Rob

I don't see any value in heavy-duty overengineering with Delrin. I've restored plenty of third-tier syringe fillers, and I've gravitated over time to craft foam. It's resilient, it's a closed-cell foam and won't absorb or leak ink, and it's easy to work. I use an X-acto knife to cut the joint between the celluloid washer and the celluloid shaft, take off the washer and the dead seal, cut and install a new seal, and fuse the washer back in place. The hardest part with most of these pens is getting the section off the barrel; once past that hurdle, it's 10 minutes or less to restore the filler to almost-original condition. Works fine, lasts a long time. Why spend half an hour fixing the piston inauthentically with an expensive material?